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Sometimes you want to delete a site column from SharePoint and you get the nice message stating “Site columns which are included in content types cannot be deleted. Remove all references to this site column prior to deleting it.”. Really helpful that it states in which ContentTypes the field is used. It gets even worse when the column is also used in lists… You can do this via PowerShell easily:

On 22 and 23 November 2011 the SharePoint Connections 2011 was held in Amsterdam. I gave a session on Visio Services and Visio Services Development. The presentation and the files used you can download here.